Ang Chen, Bo Shen and Xihe Zhu

repeatedly regarded as detrimental (e.g., Ennis, 1996 , 1998 ), Ennis led her research team to design and conduct three rigorous curriculum intervention studies: Sport for Peace, Science, PE, and Me!, and The Science of Healthful Living. These curriculum intervention studies often used mixedmethods with

A. Mark Williams and Bradley Fawver

determining the efficacy of any intervention strategy to enhance motor learning. Finally, while traditional pre- to posttest experimental designs retain currency in the field, greater efforts are needed to use mixedmethods (e.g., qualitative, quantitative) and alternative research designs (e.g., prospective

Maureen R. Weiss

sport specialization on long-term participation, physical activity, and health. Third, a mixed-methods approach that employs a variety of quantitative and qualitative methods is another means by which motor development and sport psychology scholars can join forces. The motor development studies I

reference to the strength of existing evidence. Three reviewers (V.G., K.O., and K.A.N.) independently appraised the quality of each of the included studies (53.5% agreement) using a 16-item quality assessment tool that can be applied to quantitative, qualitative, and mixed-method studies ( Sirriyeh, Lawton

Taylor K. Wise

. Mixedmethods were used to gather and analyze data. Initial data were quantitatively gathered through a web-based search for policies of each school. Schools were separated into two groups: First, schools in which the web search results found an official athletics ED policy; Second, schools in which a